public class Test2 {
    public String name;
    private int age;
    public void setAge(int age){
        if (age<0){
            System.out.println("你输入的年龄是不符合规范，不能为负数");
        }
    else{
        this.age = age;
        }
    }
public int getAge(){
        return age;
}
public void play(){
    System.out.println("人类可以继续娱乐活动");
}
}
